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                            <b>1.2.</b>
                        
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                            <b>1.4.</b>
                        
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                        什么是CSS
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                            <b>2.2.</b>
                        
                        选择器
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                            <b>2.2.2.</b>
                        
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                            <b>2.2.3.</b>
                        
                        群组选择器
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                            <b>2.2.4.</b>
                        
                        关系选择器
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                            <b>2.2.5.</b>
                        
                        属性选择器
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                        伪类选择器
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                        伪对象选择器
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                            <b>2.3.</b>
                        
                        常用样式分类
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                        字体样式
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                            <b>2.3.2.</b>
                        
                        盒子模型
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                        段落样式
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                            <b>2.3.5.</b>
                        
                        背景样式
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                        浮动
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                        定位
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                            <b>2.3.8.</b>
                        
                        动画及过渡效果
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                            <b>2.3.9.</b>
                        
                        外部icon图标库的使用
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                            <b>2.3.10.</b>
                        
                        利用border画三角形
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                            <b>2.3.11.</b>
                        
                        对话框旁边的小角制作
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                            <b>2.3.12.</b>
                        
                        弹性盒子
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                            <b>2.4.</b>
                        
                        小技巧
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                            <b>2.4.1.</b>
                        
                        光标和placeholder颜色
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                        部分背景透明
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                        移动端相关
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                        视口
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                        响应式网页
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                        JavaScript
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                        JavaScript的严格模式
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                            <b>4.2.</b>
                        
                        变量
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                        String
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                        Array
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                        Date
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                            <b>4.3.4.</b>
                        
                        Number
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                            <b>4.3.5.</b>
                        
                        Math
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                            <b>4.4.</b>
                        
                        运算符
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                            <b>4.5.</b>
                        
                        语句
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                            <b>4.6.</b>
                        
                        函数
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                            <b>4.7.</b>
                        
                        定时器
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                            <b>4.8.</b>
                        
                        DOM操作
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                            <b>4.8.1.</b>
                        
                        查找
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                            <b>4.8.2.</b>
                        
                        增加
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                        移除
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                            <b>4.9.</b>
                        
                        在HTML中使用JavaScript
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                            <b>4.10.</b>
                        
                        JavaScript控制样式和属性
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                            <b>4.11.</b>
                        
                        JSON相关
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</code></pre>
</li>
</ol>
<h3 id="&#x6E10;&#x53D8;&#x8272;&#x5F69;">&#x6E10;&#x53D8;&#x8272;&#x5F69;</h3>
<blockquote>
<p>gradient</p>
</blockquote>
<h2 id="&#x80CC;&#x666F;&#x56FE;&#x7247;">&#x80CC;&#x666F;&#x56FE;&#x7247;</h2>
<blockquote>
<p>background-image&#x4E3A;&#x4E00;&#x4E2A;&#x5143;&#x7D20;&#x8BBE;&#x7F6E;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x80CC;&#x666F;&#x56FE;</p>
</blockquote>
<pre><code class="lang-css"><span class="hljs-rule"><span class="hljs-attribute">background-image</span>:<span class="hljs-value"> <span class="hljs-function">url</span>(xxx/xxx.png)</span></span>;
</code></pre>
<h2 id="&#x80CC;&#x666F;&#x91CD;&#x590D;&#x6A21;&#x5F0F;">&#x80CC;&#x666F;&#x91CD;&#x590D;&#x6A21;&#x5F0F;</h2>
<blockquote>
<p>background-repeat&#x8BBE;&#x7F6E;&#x80CC;&#x666F;&#x56FE;&#x7684;&#x91CD;&#x590D;&#x65B9;&#x5F0F;&#xFF0C;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x53EF;&#x4EE5;&#x6CBF;&#x7740;&#x6C34;&#x5E73;&#x8F74;&#xFF0C;&#x5782;&#x76F4;&#x8F74;&#xFF0C;&#x4E24;&#x4E2A;&#x8F74;&#x91CD;&#x590D;&#xFF0C;&#x6216;&#x8005;&#x6839;&#x672C;&#x4E0D;&#x91CD;&#x590D;&#x3002;</p>
</blockquote>
<p>&#xFF08;&#x9ED8;&#x8BA4;&#x503C;&#x662F;repeat&#xFF09;</p>
<table>
<thead>
<tr>
<th>&#x503C;</th>
<th>&#x63CF;&#x8FF0;</th>
</tr>
</thead>
<tbody>
<tr>
<td>repeat-x</td>
<td>&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5728;&#x6A2A;&#x5411;&#x4E0A;&#x5E73;&#x94FA;</td>
</tr>
<tr>
<td>repeat-y</td>
<td>&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5728;&#x7EB5;&#x5411;&#x4E0A;&#x5E73;&#x94FA;</td>
</tr>
<tr>
<td>repeat</td>
<td>&#x9ED8;&#x8BA4;&#x503C;&#xFF0C;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5728;&#x6A2A;&#x5411;&#x548C;&#x7EB5;&#x5411;&#x5E73;&#x94FA;</td>
</tr>
<tr>
<td>no-repeat</td>
<td>&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x4E0D;&#x5E73;&#x94FA;</td>
</tr>
<tr>
<td>round</td>
<td>&#x4F18;&#x96C5;&#x5E73;&#x94FA;&#xFF0C;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x81EA;&#x52A8;&#x7F29;&#x653E;&#x76F4;&#x5230;&#x9002;&#x5E94;&#x4E14;&#x586B;&#x5145;&#x6EE1;&#x6574;&#x4E2A;&#x5BB9;&#x5668;</td>
</tr>
<tr>
<td>space</td>
<td>&#x6839;&#x636E;&#x5BB9;&#x5668;&#x7A7A;&#x95F4;&#x8FDB;&#x884C;&#x5E73;&#x94FA;&#xFF0C;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x4EE5;&#x76F8;&#x540C;&#x7684;&#x95F4;&#x8DDD;&#x5E73;&#x94FA;&#x4E14;&#x586B;&#x5145;&#x6EE1;&#x6574;&#x4E2A;&#x5BB9;&#x5668;&#x6216;&#x67D0;&#x4E2A;&#x65B9;&#x5411;</td>
</tr>
</tbody>
</table>
<pre><code class="lang-css"><span class="hljs-rule"><span class="hljs-attribute">background-repeat</span>:<span class="hljs-value"> repeat</span></span>;
</code></pre>
<h2 id="&#x80CC;&#x666F;&#x5B9A;&#x4F4D;">&#x80CC;&#x666F;&#x5B9A;&#x4F4D;</h2>
<blockquote>
<p>background-position&#x6307;&#x5B9A;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x7684;&#x521D;&#x59CB;&#x4F4D;&#x7F6E;</p>
</blockquote>
<p><strong>&#x6CE8;&#x610F;&#xFF1A;&#x9ED8;&#x8BA4;&#x503C;lfet top&#xFF0C;&#x8BA1;&#x7B97;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x53C2;&#x8003;&#x70B9;&#x90FD;&#x662F;&#x5143;&#x7D20;&#x7684;&#x5DE6;&#x4E0A;&#x89D2;</strong>   </p>
<table>
<thead>
<tr>
<th>&#x503C;</th>
<th>&#x63CF;&#x8FF0;</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>&lt;percentage&gt;</code></td>
<td>&#x7528;&#x767E;&#x5206;&#x6BD4;&#x6307;&#x5B9A;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x586B;&#x5145;&#x7684;&#x4F4D;&#x7F6E;,&#x53EF;&#x4EE5;&#x4E3A;&#x8D1F;&#x503C;</td>
</tr>
<tr>
<td><code>&lt;length&gt;</code></td>
<td>&#x7528;&#x957F;&#x5EA6;&#x503C;&#x6307;&#x5B9A;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x586B;&#x5145;&#x7684;&#x4F4D;&#x7F6E;,&#x76F8;&#x5BF9;&#x5BB9;&#x5668;&#x7684;&#x4F4D;&#x7F6E;,&#x53EF;&#x4EE5;&#x4E3A;&#x8D1F;&#x503C;</td>
</tr>
<tr>
<td>center</td>
<td>&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x6A2A;&#x5411;&#x548C;&#x7EB5;&#x5411;&#x5C45;&#x4E2D;</td>
</tr>
<tr>
<td>left</td>
<td>&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5728;&#x6A2A;&#x5411;&#x4E0A;&#x586B;&#x5145;&#x4ECE;&#x5DE6;&#x8FB9;&#x5F00;&#x59CB;</td>
</tr>
<tr>
<td>right</td>
<td>&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5728;&#x6A2A;&#x5411;&#x4E0A;&#x586B;&#x5145;&#x4ECE;&#x53F3;&#x8FB9;&#x5F00;&#x59CB;</td>
</tr>
<tr>
<td>top</td>
<td>&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5728;&#x7EB5;&#x5411;&#x4E0A;&#x586B;&#x5145;&#x4ECE;&#x9876;&#x90E8;&#x5F00;&#x59CB;</td>
</tr>
<tr>
<td>bottom</td>
<td>&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5728;&#x7EB5;&#x5411;&#x4E0A;&#x586B;&#x5145;&#x4ECE;&#x5E95;&#x90E8;&#x5F00;&#x59CB;</td>
</tr>
</tbody>
</table>
<p>&#x80CC;&#x666F;&#x56FE;&#x8DDD;&#x79BB;&#x53F3;&#x8FB9;&#x548C;&#x5E95;&#x90E8;&#x5404;&#x6709;20px</p>
<pre><code class="lang-css"><span class="hljs-rule"><span class="hljs-attribute">background</span>:<span class="hljs-value"><span class="hljs-function">url</span>(test1.jpg) no-repeat right <span class="hljs-number">20px</span> bottom <span class="hljs-number">20px</span></span></span>;
</code></pre>
<h2 id="&#x80CC;&#x666F;&#x5706;&#x70B9;">&#x80CC;&#x666F;&#x5706;&#x70B9;</h2>
<blockquote>
<p>background-origin&#x8BBE;&#x7F6E;&#x5143;&#x7D20;&#x80CC;&#x666F;&#x56FE;&#x7247;&#x7684;&#x539F;&#x59CB;&#x8D77;&#x59CB;&#x4F4D;&#x7F6E;&#xFF0C;&#x5FC5;&#x987B;&#x4FDD;&#x8BC1;&#x80CC;&#x666F;&#x662F;background-repeat&#x4E3A;no-repeat
&#x6B64;&#x5C5E;&#x6027;&#x624D;&#x4F1A;&#x751F;&#x6548;&#x3002;</p>
</blockquote>
<p><strong>&#x6CE8;&#x610F;&#xFF1A;&#x5F53;&#x4F7F;&#x7528; background-attachment&#xFF08;&#x51B3;&#x5B9A;&#x80CC;&#x666F;&#x662F;&#x5728;&#x89C6;&#x53E3;&#x4E2D;&#x56FA;&#x5B9A;&#x7684;&#x8FD8;&#x662F;&#x968F;&#x5305;&#x542B;&#x5B83;&#x7684;&#x533A;&#x5757;&#x6EDA;&#x52A8;&#x7684;&#xFF09;&#x4E3A;fixed&#x65F6;&#xFF0C;&#x8BE5;&#x5C5E;&#x6027;&#x5C06;&#x88AB;&#x5FFD;&#x7565;&#x4E0D;&#x8D77;&#x4F5C;&#x7528;&#x3002;</strong></p>
<ol>
<li>border-box   </li>
</ol>
<p>&#x80CC;&#x666F;&#x5C06;&#x4F1A;&#x5EF6;&#x4F38;&#x5230;&#x5EF6;&#x4F38;&#x5230;&#x5916;&#x8FB9;&#x754C;&#x7684;&#x8FB9;&#x6846;&#xFF0C;&#x800C;&#x4E14;&#x662F;&#x300C;&#x8FB9;&#x6846;&#x5728;&#x4E0A;&#x3001;&#x80CC;&#x666F;&#x5728;&#x4E0B;&#x300D;&#xFF0C;&#x8FD9;&#x4E2A;&#x7528;border-style &#x4E3A;dashed&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x770B;&#x5F97;&#x51FA;&#x6765;&#x3002;</p>
<ol>
<li>padding-box   </li>
</ol>
<p>&#x80CC;&#x666F;&#x63CF;&#x7ED8;&#x5728;padding&#x76D2;&#x5B50;&#xFF0C;&#x8FB9;&#x6846;&#x91CC;&#x4E0D;&#x4F1A;&#x6709;&#x80CC;&#x666F;&#x51FA;&#x73B0;&#x3002;&#x540C;&#x6837;&#xFF0C;&#x80CC;&#x666F;&#x5C06;&#x4F1A;&#x5EF6;&#x4F38;&#x5230;&#x6700;&#x5916;&#x8FB9;&#x754C;&#x7684;padding&#x3002;</p>
<ol>
<li>content-box   </li>
</ol>
<p>&#x80CC;&#x666F;&#x63CF;&#x7ED8;&#x5728;&#x5185;&#x5BB9;&#x533A;&#x8303;&#x56F4;&#x3002;</p>
<p><img src="../../../img/background-1.png" alt="background-1"></p>
<h2 id="&#x80CC;&#x666F;&#x7684;&#x663E;&#x793A;&#x533A;&#x57DF;">&#x80CC;&#x666F;&#x7684;&#x663E;&#x793A;&#x533A;&#x57DF;</h2>
<blockquote>
<p>background-clip&#x8BBE;&#x5B9A;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5411;&#x5916;&#x88C1;&#x526A;&#x7684;&#x533A;&#x57DF;</p>
</blockquote>
<table>
<thead>
<tr>
<th>&#x503C;</th>
<th>&#x63CF;&#x8FF0;</th>
</tr>
</thead>
<tbody>
<tr>
<td>padding-box</td>
<td>&#x4ECE;padding&#x533A;&#x57DF;&#xFF08;&#x4E0D;&#x542B;padding&#xFF09;&#x5F00;&#x59CB;&#x5411;&#x5916;&#x88C1;&#x526A;&#x80CC;&#x666F;</td>
</tr>
<tr>
<td>border-box</td>
<td>&#x4ECE;border&#x533A;&#x57DF;&#xFF08;&#x4E0D;&#x542B;border&#xFF09;&#x5F00;&#x59CB;&#x5411;&#x5916;&#x88C1;&#x526A;&#x80CC;&#x666F;</td>
</tr>
<tr>
<td>content-box</td>
<td>&#x4ECE;content&#x533A;&#x57DF;&#x5F00;&#x59CB;&#x5411;&#x5916;&#x88C1;&#x526A;&#x80CC;&#x666F;</td>
</tr>
<tr>
<td>text</td>
<td>&#x4ECE;&#x524D;&#x666F;&#x5185;&#x5BB9;&#x7684;&#x5F62;&#x72B6;&#xFF08;&#x6BD4;&#x5982;&#x6587;&#x5B57;&#xFF09;&#x4F5C;&#x4E3A;&#x88C1;&#x526A;&#x533A;&#x57DF;&#x5411;&#x5916;&#x88C1;&#x526A;&#xFF0C;&#x5982;&#x6B64;&#x5373;&#x53EF;&#x5B9E;&#x73B0;&#x4F7F;&#x7528;&#x80CC;&#x666F;&#x4F5C;&#x4E3A;&#x586B;&#x5145;&#x8272;&#x4E4B;&#x7C7B;&#x7684;&#x906E;&#x7F69;&#x6548;&#x679C;</td>
</tr>
</tbody>
</table>
<p><img src="../../../img/background-2.png" alt="background-2"></p>
<p>&#x8FD8;&#x6709;&#x4E00;&#x79CD;&#x53EA;&#x906E;&#x6321;&#x6587;&#x5B57;&#x7684;&#x6548;&#x679C;</p>
<pre><code class="lang-css"><span class="hljs-id">#div</span><span class="hljs-rules">{
    <span class="hljs-rule"><span class="hljs-attribute">background-image</span>:<span class="hljs-value"> <span class="hljs-function">url</span>(img/drag.png)</span></span>;
    <span class="hljs-rule"><span class="hljs-attribute">-webkit-background-clip</span>:<span class="hljs-value"> padding-box</span></span>;<span class="hljs-comment">/*&#x9664;&#x4E86;&#x6587;&#x672C;&#x5916;&#x7684;&#x4E1C;&#x897F;&#x5168;&#x90E8;&#x5207;&#x6389;*/</span>
    <span class="hljs-rule"><span class="hljs-attribute">color</span>:<span class="hljs-value">transparent</span></span>;<span class="hljs-comment">/*&#x628A;&#x5B57;&#x4F53;&#x53D8;&#x900F;&#x660E;*/</span>
}</span>
</code></pre>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-title">div</span> <span class="hljs-attribute">id</span>=<span class="hljs-value">&quot;div&quot;</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-title">p</span>&gt;</span>123123465<span class="hljs-tag">&lt;/<span class="hljs-title">p</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-title">div</span>&gt;</span>
</code></pre>
<h2 id="&#x80CC;&#x666F;&#x5C3A;&#x5BF8;">&#x80CC;&#x666F;&#x5C3A;&#x5BF8;</h2>
<table>
<thead>
<tr>
<th>&#x503C;</th>
<th>&#x63CF;&#x8FF0;</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>&lt;length&gt;</code></td>
<td>&#x7528;&#x957F;&#x5EA6;&#x503C;&#x6307;&#x5B9A;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5927;&#x5C0F;&#xFF0C;&#x4E0D;&#x5141;&#x8BB8;&#x8D1F;&#x503C;</td>
</tr>
<tr>
<td><code>&lt;percentage&gt;</code></td>
<td>&#x7528;&#x767E;&#x5206;&#x6BD4;&#x6307;&#x5B9A;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x5927;&#x5C0F;&#x3002;&#x4E0D;&#x5141;&#x8BB8;&#x8D1F;&#x503C;</td>
</tr>
<tr>
<td>auto</td>
<td>&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x7684;&#x771F;&#x5B9E;&#x5927;&#x5C0F;</td>
</tr>
<tr>
<td>cover</td>
<td>&#x5C06;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x7B49;&#x6BD4;&#x7F29;&#x653E;&#x5230;&#x5B8C;&#x5168;&#x8986;&#x76D6;&#x5BB9;&#x5668;&#xFF0C;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x6709;&#x53EF;&#x80FD;&#x8D85;&#x51FA;&#x5BB9;&#x5668;</td>
</tr>
<tr>
<td>contain</td>
<td>&#x5C06;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x7B49;&#x6BD4;&#x7F29;&#x653E;&#x5230;&#x5BBD;&#x5EA6;&#x6216;&#x9AD8;&#x5EA6;&#x4E0E;&#x5BB9;&#x5668;&#x7684;&#x5BBD;&#x5EA6;&#x6216;&#x9AD8;&#x5EA6;&#x76F8;&#x7B49;&#xFF0C;&#x80CC;&#x666F;&#x56FE;&#x50CF;&#x59CB;&#x7EC8;&#x88AB;&#x5305;&#x542B;&#x5728;&#x5BB9;&#x5668;&#x5185;</td>
</tr>
</tbody>
</table>
<h2 id="&#x80CC;&#x666F;&#x6837;&#x5F0F;&#x7F29;&#x5199;">&#x80CC;&#x666F;&#x6837;&#x5F0F;&#x7F29;&#x5199;</h2>

                    
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